The specs are out:
https://www.canonrumors.com/here-are...-mount-lenses/

30.3mp Full Frame CMOS
Dual pixel CMOS AF
100% vertical x 88% horizontal AF coverage (We think)
EV -6 low brightness autofocus
4K video
Touchscreen LCD
Articulating screen
Wi-Fi · Bluetooth
Dustproof
Drip-proof
Magnesium body
Battery: LP-E6N
Battery grip: BG-E22
Size: Width of about 136 mm × height of about 98 mm
Weight: Approximately 580 g
Mount: inner diameter 54 mm, flange back 20 mm, 12 pin
Mount adapter: “Mount adapter EF – EOS R” “Control ring mount adapter EF – EOS R” “Drop – in filter mount adapter EF – EOS R”